Type-writing machine.



J. COOPER;

TYPE WRITING MACHINE,

APRWCATION FILED NOV. 25, 1911.

Llfi filfio Patented Jan. 25, 1916.

" I FEM.

JOHN JOSEPH COOPER, OF LONDON, ENGLAND, ASSIGNOR T0 UNDERWOOD TYPE- WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPE-WRITING- MACHINE.

meagre.

Specification of Letters Patent.

Patented Jan. 25, 1916.

Application filed November 25, 1911. Serial No. 662,260.

chanically-played piano) it is usually desirable that the sheet, initially wound upon one roller, should be drawn therefrom and, after being passed around the platen, wound upon a second roller whence the sheet may afterward be drawn and re-wound upon the first-mentioned roller. Under these circumstances it is necessary that whichever of the two rollers is, for the time being, the takeup roller, should be positively driven in order that the slack of the sheet (interveningbetween this roller and the printing point) should be taken up; the other roller, which for the time being is the pay-out roller, may be allowed to run free under the pull transmitted by the sheet. The positively-driven take-up roller must, however, be so actuated that its angular velocity shall be capable of diminishing progressively in accordance with the constant increase in the effective diameter of this roller clue to the lapping upon it of successive convolutions of the sheet, the line-spacing movement of the sheet past the printing point on the platen usually is performed by constantly equal increments.

The object of the present invention is to enable these results to be effected by providing means whereby the rotation of the platen itself imparts the necessary rotary movement to that roller which, for the time being, happens to be the take-up roller; this roller being so driven as to have a constant tendency (checked by the tension of the sheet) to overrun the platen, while the other roller (which, for the time being, is the payout roller) runs free.

According to the invention, the take-up I roller may be driven from the platen,

through the medium of a combined elastic and frictional belt constantly tending to impart to the intermediate member an angular velocity in excess of that required to take up the slack of the sheet even when the empty take-up roller first begins to wind; this belt may drive the take-up roller through the medium of a pawl and ratchet so that, when the direction of feed is reversed, and said roller becomes the pay-0E roller, it is driven solely by the pull transmitted by the sheet.

In the accompanying drawings, which illustrate a convenient arrangement embodying the invention, Figure 1 is a part rear elevation of a typewriting machine, showing the platen, the two rollers, and the driving connections between them, the remainder of the machine being omitted for the sake of clearness. Fig. 2 is a section on line 22 of Fig. 1, looking in a direction parallel to the axes of the platen and rollers.

The typewriter carriage, not shown herein, carries the usual rotary platen A mounted on the spindle a which may be turned by a line-space mechanism, not shown herein, or by the usual handwheel 0 The typewriter carriage likewise carries a roll holder in the form of a frame work comprising cheek plates G, G G which are held together by tie-rods g, and in said frame are journaled two spools B and C on which a web may be carried during the operation of writing. Said spools are such spools as are commonly employed to carry the tune sheets of mechanically played pianos, and are fixed on spindles b and 0 respectively. The spool C is removably supported on stub shafts H and H and is placed in position on said shafts by inserting the end of its spindle c in a cup 71. on the end of the stub shaft H Said stub shaft H is journaled in and movable endwise in an extension j on the plate G, and bears against a spring, not shown, in said extension, so that when the spindle 0 is placed in position, the stub shaft H will be pressed into said extension. When so'pressed in, the opposite end of the spindle a may be caused to engage the stub shaft H fixedly journaled at'j and j on the plates G and G forming the frame-work. Said stub shaft H? comprises a slot into which a cross bar 71, of the spindle a fits and when so fitted the spindle 0 is held-in place by means of the concealed spring bearing against the, stub shaft H at the opposite end of the spindle. A web'D on the spool C is.

led forwardly around the platen and then upwardly and rearwardly, as shown at d in Fig. 2, to the upper spool B, which spool B comprises a spindle b inserted in a cup member 6 on the end of a stub shaft E journaled in an extension f on the plate G, which stub shaft is spring pressed as is the stub shaft H The opposite end of said spindle b comprises a cross bar 6 which will slip into a slot in the end of a stub shaft E when the spool B is pressed to the right against the stub shaft E to compress the concealed spring in the extension f. Said pulley L, then downwardly to a pulley N' p on the stub shaft H said pulley N corresponding in every respect to the pulley L, thence over the idle wheel Q and under the pulley O, thus forming a continuous belt. All the pulleys comprise deep grooves, in which the belt travels, and the pulley Q, around which the belt passes twice, has on it two such grooves so that the two runs of the belt F are kept separate from each other.

The effective diameter 'of the pulleys L and N is considerably less than the effective diameters of the spools B and C, while the diameter of the pulley O is the same as that of the platen A. It will therefore be seen that if the belt is driven from the platen, it tends to wind a web on either of said spools faster than the platen feeds the web, in other Words, unless the belt slips on some one of the pulleys, the web D will be drawn along by the spool on which it is being wound, faster than the platen would move it. Said pulleys are so arranged that only the spool on which the web is being wound is positively turned at any time'by the belt P while the other spool is turned by the pull of the web on it. For this purpose the pulley L is free to turn on its stub shaft E and engages its. stub shaft by means of spring pressed pawl is pivoted on the pulley, and working in a ratchet wheel K fast on the stub shaft. the stub shaft H drives the spool (Jby a spring pawl m on said pulley engaging a ratchet wheel M fast on said stub shaft. The one-way driving pawls 7c and m are arranged so that if the platen is rotated forwardly the upper spool-B will be driven by the belt P to wind the web D while the lower pulley N will turn idly with respect to its Similarly the pulley N on means of the ratchet wheel M fast on the axle H of said spoolq Variations may be resorted to within the scope of the invention, and portionsof the improvements may be used without others.

Claims: 1. In a typewriting machine, the combination with a rotatable platen, of a pair of spools, movement-multiplying connections between the platen and the spools, including a belt driven by the rotary platen, and a pulley for each spool, over which said belt passes, the relation of the diameters of the pulleys to those of the platen and spools beingsuch that either spool when used as the winding spool will tend to draw a web faster than the platen delivers it, and a pawl-andratchet connection between each pulley and its spool arranged to drive the spool onto which a web is being wound, but to let the other spool run idle.

2. In a typewriting machine, the combination with a rotatable platen, of a pulley driven by said platen, a spool driven by said pulley, a slip belt so driving said pulley, and a one-way clutch between the pulley and the spool, said pulley operative for positively driving the platen when the pulley is rotated in one direction, the pulley being free to rotate independently of the platen in the reverse direction, said belt having a slip driving connection with the pulley. v

3. In a typewriting machine, the combina tion with a rotatable platen, of a pair of spools, a pulley fast to the platen, a :pulley for each spool, a slip belt running over said pulleys arranged to over-drive a spool with reference to the platen pawl and ratchet connection between eac 1 pulley and its spool, and an idle pulley over which said belt runs.

4. In a typewriting machine, the combination with a rotatable platen, of a roll holder, a pair of spools in said holder, a pulley for each spool, a one-way driving connection between ench spool and its pulley, a pulley on the platen arranged to over-drive said spools.

relatively to the platen, and an elastic belt for so driving said spools.

5. In a typewriting machine, the combination with a revoluble platen, of two paperspools from which a paper-strip or web is led around the platen, one end of the strip being wound on one spool, and the other end being wound on the other spool, and connections from the platen to both spools separate from said web or paper-strip to cause one spool to wind and the other spool to pay out idly when the platen is turning in one direction, and to cause reverse movements of the spools when the platen is turned in the other direction.

6. In a typewriting machine, the combination with a revoluble platen, of .two paperspools from which a paper-strip or web is led around the platen, one end of the strip being Wound on one spool, and the other end being wound on the other spool, and connections from the platen to both spools inde pendent of the said paper-strip or web to cause one spool to wind and the other spool to pay out idly when the platen is turning in one direction, and to cause reverse movements of the spools when the platen is turned in the other direction, the connections between the platen and said spools having provision for a slip between the platen and the spools, to 1 keepthe strip or web taut without liability of rupturing the same.

7. The combination with a revoluble platen, of two paper-spools from one of which the paper strip or webis led around the platen to the other spool, driving connections between the platen and the spools including a pawl and ratchet for each spool, the pawls and ratchets being constructed to driveone spool to takeup the web, and permit the other to pay out when the platen is turned in one direction, and have a reverse effect when the platen is turned in the other direction.

8. In a typewriting machine, the combination with a rotatable platen, of a pair of spools, a pulley connected to the platen, a

work-sheet or web to the platen, pulleys for said spools, and a slipbelt connecting all of said pulleys and arranged to drive the receiving spool with a greater peripheral speed than that of the platen;

10. In a typewriting-machine, the combination with arotatable platen, of a pulley connected to the platen axle, spools to receive .a work-sheet or web extending be tween the platen and spools, a pulley for each of said spools, a slip belt connecting all of said pulleys and arranged to drive the spools with greater peripheral speed than that of the platen, and a one-way driv- -1ng connectlon between each spool and its pulley. v

11. In a typewritin'g machine, the combination with a rotatable platen, of receiving and supply spools between which a web extends over the platen, a pulley on the platen axle, spindles for the'spools, pulleys loose on said spindles, and a one-way driving connection between each spool spindle and its pulleyto positively drive the spool on which the web is being received as it is fed over the platen.

12. In a typewriting machine, the combirece1ving to rotate all of them in the same direction,

and a one-way driving connection between the receiving spool and its pulley to rotate said receivingspool by power transmitted through the slip belt.

13. In a typewriting machine, the combination with a rotatable platen, of a supply spool, a receiving spool, shafts on which said spools are mounted, pulleys for driving said shafts, a pulley connected to the platen, a slip belt extending over all of said pulleys to rotate all of them in the same direction, a one-way driving connection between the receiving spool and its pulleyto rotate said i spool v by power transmitted through the slip belt, and a one-way driving connection between the supply spool and its vpulley arranged to drive the supply spool by power transmitted through the slip belt when the platen is rotated backwardly.

14. In a typewriting machine, thecombination with a rotatable platen, of a spool, a pulley to drive said spool, a belt driven by said platen and passing around said pulley tending to overdrive said spool, a pawl and ratchet connection between said pulley and the spool, a second spool having a pulley driven by said belt, and'a pawl and ratchet connection between said second pulley and its spool, each pawl and ratchet connectionpermitting the. associated pulley to runidly with respect to its spool when theother pulley is driving its spool.

15. In a typewriting machine, the combi- "nation with a rotatable platen, of a roll while the movement of the platen is reversed, a second spool from which said web extends over the platen to the first spool, and driving means connecting, the second spool to the platen to wind the web back thereon as the movement of the platen is reversed, and to permit the web to pay off as it is wound upon the first spool; each. of mg driving means being distinct from the we 17. The combination with a revoluble platen over which a web may run, of two winding devices, and meansconnecting said winding devices to the platen to be efiective alternately, for winding theweb at either one end or the other, according as the platen is rotated in one direction or the other, each of said winding devices including a one-way driving device, to permit the web to pay off when the other winding device is effective; eachof said winding devices being distinct from the web.

18. The combination with a platen, of a spool on which a web fed over the platen may be wound, a second spool from which the web may be unwound as it is fed over the platen, means driven by the platen for rotating said first-mentioned spool to wind the web thereon as the platen is rotated in line-spacing direction, said means permitting the platen to be rotated in the reverse direction without driving said first-mentioned spool, and means operated by the platen when rotated in said reverse direction to wind the web onto said second spool.

19, The combination with a platen, of a winding spool on which a web extending over the platen may be Wound as the platen is advanced in line-spacing direction, a supply spool from which the web may extend to the platen, means operated by the platen for driving said winding spool and tending to rotate the latter at a greater peripheral speed than that of the platen as the latter is advanced, said driving-means comprising a I slip connection to prevent undue tension on the web, said driving means also comprising a one-way-driving connection permitting the movement of the platen to be reversed without rotating the winding spool through said driving means, and means driven by the platen for rotating said supply spool and thereby winding the web thereon during the reverse movement of the platen.

20. The combination with a rotary platen, of a winding spool on which a web extend ing over the platen may be wound as the platen is rotated in a forward direction, a supply spool from which the web is supplied'to the platen, driving means operated by the platen to rotate the winding spool as the platenis advanced, said driving means tending to'over-wind the winding spool and comprising a slip connection to permit the peripheral speed of the winding spool to be reduced to that of the platen, saidvdriving means also comprising a one-way driving connection permitting the platen to be rotated backwardly without rotating the winding spool through said driving means, and driving means between the platen and the supply spool for rotating the latter backwardly as the platen is rotated platen without driving the supply spool through the said last-named driving means.

21. The combination with a. platen, of a spool to receive one end of a web or strip extending over the platen, a second spool from which the web extends to the platen, pulleys each having a one-way driving connection with said spools, and a flexible power-transmitting element driven by the platen and extending over said pulleys and having a slip connection with said pulleys, each of said pulleys being of a size tending to over-wind its spool when said spool is driven in a direction to wind the web thereon, said one-way driving connections each arranged to permit the flexible driving member to run idly with respect to the associated spool when the web is being wound on the opposite spool.

22. The combination with a revoluble typewriter platen over which a paper workweb may run, of-spools or rolls on which the ends of thepaper web are wound, and

driving means between the platen and each spool whereby either spool may beldriven from the platen to wind the web as the platen is rotated, said driving means each comprising a one-way driving connection to prevent the platen from driving the associated spool while the platen is rotated in a direction to wind the web on the other spool; said driving means being distinct from the web.

JOHN JOSEPH COOPER.

Witnesses:

L. G, MORGAN, HERBERT D, JAMEsoN. 

